Pharmaceutical composition of polyethylene glycol-modified camptothecin derivative and preparation method thereof

ABSTRACT

A pharmaceutical composition of a polyethylene glycol-modified camptothecin derivative and a preparation method thereof. The pharmaceutical composition is prepared mainly from following components: a camptothecin derivative modified by polyethylene glycol, a pH value adjustment agent and water for injection. The pharmaceutical composition has high stability.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation application of International patent application No. PCT/CN2015/096151, filed on Dec. 1, 2015, which claims the benefit and priority of Chinese patent application No. CN201410739978.X, filed on Dec. 5, 2014, each of which is incorporated herein by reference in its entirety and for all purposes.

FIELD OF THE INVENTION

The present invention belongs to the field of medicine, and in particular to a pharmaceutical composition of a polyethylene glycol-modified camptothecin derivative for injection and a preparation method and an application thereof.

BACKGROUND OF THE INVENTION

Camptothecin (CPT, Formula 1) is a natural product isolated from Nyssaceae plant Camptotheca acuminata, which was introduced into clinical practice in the early 1970s due to its excellent anticancer activity, later, due to diarrhea, hemorrhagic cystitis and other serious side effects, the clinical trials were terminated.

Since the 1990s, a number of camptothecin derivatives have come into the market or entered into clinical studies successively, including 10-hydroxycamptothecin, 7-ethyl-10-hydroxycamptothecin, 9-nitrocamptothecin, 9-aminocamptothecin, irinotecan (CPT-11, Formula 2), topotecan and belotecan, exatecan, lurtotecan, diflomotecan, gimatecan, karenitecin, and so on. Among them, irinotecan has a very broad antitumor spectrum, and Phase I, II clinical study results show that the drug has a positive effect on chemotherapy-resistant tumors such as metastatic colorectal cancer, non-small cell lung cancer, ovarian cancer and cervical cancer, and also has a certain effect on gastric cancer, malignant lymphoma non-Hodgkin's lymphoma, breast cancer, small cell lung cancer, skin cancer, pancreatic cancer. It is now mainly used as an effective drug for the treatment of advanced colorectal cancer, and can still be effective for 5-FU resistant cases.

However, camptothecin derivatives, including irinotecan, have a good anticancer activity, but still have some shortcomings, such as a poor solubility in water, great toxic side effects. The common adverse reactions are anorexia, nausea, vomit, diarrhea, leukopenia and neutropenia, anemia and thrombocytopenia, alopecia and acetylcholine syndrome. Especially diarrhea is the most common, nearly 90% of the subjects have diarrhea, of which nearly 30% have severe diarrhea.

Polyethylene glycol modification technology is a new technology developed rapidly in recent years, which is linking polyethylene glycol after activation to a drug molecule or surface to form a prodrug, and when the polyethylene glycol-drug complex enters the body, it can slowly release the drug molecule thus to produce curative effect. The polyethylene glycol-modified drug molecules have the following advantages: 1, increased water solubility of drugs; 2, reduced toxicity; 3, extended cycle half-life of drugs, reduced medication times, improved patient compliance, improved quality of life, reduced treatment cost; 4, reduced enzyme degradation effect, improved bioavailability.

Polyethylene glycol modification technology has been applied in camptothecin derivatives, WO2005028539 reports a series of compounds in which a multi-branched polyethylene glycol is linked to irinotecan, currently, in which one drug named etirinotecan pegol (Formula 3) is undergoing Phase III clinical trials for the treatment of metastatic breast cancer and colorectal cancer in a number of countries.

WO2007081596 reports a series of compounds in which a polyethylene glycol is linked to 7-ethyl-10-hydroxycamptothecin (an active metabolite of irinotecan in vivo), currently, in which one drug named firtecan pegol is undergoing Phase II clinical trials for the treatment of breast cancer and colorectal cancer in a number of countries.

CN103083680 discloses a polyethylene glycol-amino acid oligopeptide-irinotecan conjugate as shown in formula (4) having antitumor activity for the treatment of colorectal cancer, ovarian cancer and lung cancer, etc.

There have been no reports of pharmaceutical compositions of polyethylene glycol-modified camptothecin derivatives for injection in the prior art.

In the prior art, the pharmaceutical composition of the camptothecin derivative is mostly a lyophilized preparation for injection, and CN103655491 reports a pharmaceutical composition of an irinotecan hydrochloride and a preparation method thereof, wherein the irinotecan hydrochloride is prepared into a lyophilized preparation, however, in the preparation process not only irinotecan hydrochloride and water for injection are used, lactose, ethanol and other additives are also used, which may not only increase the cost of product, more importantly, introduce substances that may affect the efficacy and produce side effects, resulting in uncertainty factors for the drug safety.

In addition, in the prior art, high molecular weight polyethylene glycol amino acid oligopeptides are linked to camptothecin derivative through ester bonds, the ester bonds have a poor stability, especially in a humid environment is easier to be hydrolyzed slowly and thus release the camptothecin derivative, which thereby affects the effect of polyethylene glycol modified drugs, and in the preparation, storage and use of injections, particularly lyophilized preparations for injection, contact with the humid environment is unavoidable, resulting in a slow degradation of the pharmaceutical composition of the polyethylene glycol-modified camptothecin derivative, which affects the drug stability.

SUMMARY OF THE INVENTION

It is one object of the present invention to provide a pharmaceutical composition of a polyethylene glycol-modified camptothecin derivative which has a high stability and can conform to the molding requirements and quality requirements of preparation and a preparation method thereof.

It is another object of the present invention to solve the problem that the polyethylene glycol-modified camptothecin derivative has a poor stability, and is easier to be slowly hydrolyzed in a humid environment and thus release the camptothecin derivative, which may thereby affect the effect of the polyethylene glycol-modified drug.

It is also one object of the present invention to provide an application of the pharmaceutical composition of polyethylene glycol-modified camptothecin derivative in the treatment of cancer.

Thus, one aspect of the present invention is to provide a pharmaceutical composition of a polyethylene glycol-modified camptothecin derivative which is mainly prepared by the following components: a polyethylene glycol-modified camptothecin derivative, pH adjuster and water for injection, wherein the pharmaceutical composition comprises 100 to 500 mg of the polyethylene glycol-modified camptothecin derivative.

The polyethylene glycol-modified camptothecin derivative of the present invention has the structure of the general formula (I):

wherein:

PEG represents a polyethylene glycol residue, PEG has a molecular weight of 300 to 60,000 Daltons;

A₁ and A₂ represent the same or different amino acid residues;

m is an integer of 2 to 12, preferably, in is 2 to 6, more preferably, in is 2 or 3;

n is an integer of 0 to 6, preferably, n is 0 to 3, more preferably, n is 0, 1, 2 or 3;

and CPT is a camptothecin derivative residue, and the camptothecin derivative is selected from the group consisting of: 10-hydroxycamptothecin, 7-ethyl-10-hydroxycamptothecin, 9-nitrocamptothecin, 9-aminocamptothecin, irinotecan, topotecan and belotecan, exatecan, lurtotecan, diflutamide, diflomotecan, gimatecan or karenitecin. Preferably, the camptothecin derivative is 7-ethyl-10-hydroxycamptothecin (Formula 5) or irinotecan (Formula 2).

Preferably, the PEG of the present invention has a molecular weight of 20,000 to 40,000 Daltons.

The PEG of the present invention may be a straight-chain, Y-type or multi-branched polyethylene glycol residue.

When PEG is a straight-chain polyethylene glycol residue, it has the structure of general formula (II):

When PEG is a Y-type polyethylene glycol residue, it has the structure of general formula (III):

wherein i is an integer of 10 to 1,500, preferably, i is an integer of 400 to 500.

When PEG is a multi-branched polyethylene glycol residue, it has the structure of general formula (IV):

wherein:

k is an integer of 10 to 1,500, preferably, k is an integer of 160 to 180;

j is an integer of 3 to 8, preferably, j is 4;

and R is a core molecule of the multi-branched polyethylene glycol, and R is selected from the group consisting of residues of pentaerythritol, methylglucoside, sucrose, diethylene glycol, propylene glycol, glycerol or polyglycerol.

A₁ and A₂ in the present invention represent the same or different amino acid residues, and A₁ and A₂ are independently selected from the group consisting of aspartic acid, glutamic acid, glycine, alanine, leucine, isoleucine, valine, phenylalanine or methionine. Preferably, the A₁ of the present invention is selected from aspartic acid or glutamic acid, the A₂ is selected from the group consisting of glycine, alanine, leucine, isoleucine, valine, phenylalanine or methionine. More preferably, A₁ is glutamic acid, A₂ is glycine.

In a specific embodiment of the present invention, when in is preferably 2, n is preferably 1 in the structure of the general formula (I), the polyethylene glycol-modified camptothecin derivative has the structure of general formula (V):

In a specific embodiment of the present invention, when in is preferably 3, n is preferably 1 in the structure of the general formula (I), the polyethylene glycol-modified camptothecin derivative has the structure of general formula (VI):

In a more preferred embodiment of the present invention, the polyethylene glycol-modified camptothecin derivative having the structure of general formula (I) is:

The content of the polyethylene glycol-modified camptothecin derivative in the pharmaceutical composition of the present invention can be determined according to the therapeutic dosage of the polyethylene glycol-modified camptothecin derivative in the art. The polyethylene glycol-modified camptothecin derivatives having different structures may be added to the pharmaceutical compositions in varying amounts. In a preferred embodiment of the present invention, the pharmaceutical composition comprises 100 to 500 mg of polyethylene glycol-modified camptothecin derivative, preferably 200 to 500 mg.

The pH adjuster of the present invention is one or a combination of more than two selected from the group consisting of hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, carbonic acid, toluenesulfonic acid, methanesulfonic acid, acetic acid, citric acid, malonic acid, tartaric acid, succinic acid, benzoic acid, ascorbic acid, α-ketoglutaric acid or α-glycerophosphoric acid. Preferably, the pH adjuster is one or a combination more than two selected from the group consisting of hydrochloric acid, acetic acid and phosphoric acid. More preferably, the pH adjuster is hydrochloric acid. The pH adjuster in the present invention is used to adjust the pH of the aqueous solution for injection comprising the polyethylene glycol-modified camptothecin derivative to 3.0 to 4.0. Since the polyethylene glycol-modified camptothecin derivatives are more stable in an acidic environment, especially acidic environment with a pH value lower than 4.0, and a faintly acidic environment with a pH value higher than 4.0, neutral or alkaline environments can cause a rapid degradation of polyethylene glycol-modified camptothecin derivatives. In the preparation process of the pharmaceutical composition of the polyethylene glycol-modified camptothecin derivative, the pH value of aqueous solution for injection comprising the polyethylene glycol-modified camptothecin derivative is adjusted to lower than 4.0 by the pH adjuster, and then a lyophilized preparation is prepared in accordance with a freeze-drying procedure. When the pH is lower than 3.0, both the appearance color of the lyophilized preparation product and the color after re-dissolution are darker, suggesting that the preparation product contains more colored impurities, so the pH is preferably in the range of 3.0 to 4.0. More preferably, the pH adjuster is used to adjust the pH of the aqueous solution for injection containing the polyethylene glycol-modified camptothecin derivative to 3.4 to 3.6.

In the present invention, the water for injection is used to provide an adjuvant material used for preparing the polyethylene glycol-modified camptothecin derivative into a preparation for injection. The water for injection is used to dissolve and dilute the polyethylene glycol-modified camptothecin derivative, which may be added in accordance with conventional additions in the art. In a specific embodiment of the present invention, the ratio of the amount of the water for injection and that of the polyethylene glycol-modified camptothecin derivative may be 10 to 80 ml/1 mg, preferably 20 to 60 ml/1 mg.

In a specific embodiment of the present invention, in addition to the polyethylene glycol-modified camptothecin derivative, the pH adjuster and the water for injection, the component further comprises a lyophilized excipient. The amount of the lyophilized excipient may be 0 to 10% (W/V), more preferably 0 to 5% (W/V) of the aqueous solution for injection comprising the polyethylene glycol-modified camptothecin derivative. The lyophilized excipient is one or more than two of mannitol, lactose, glucose, hydrolyzed gel, glycine or dextran. Preferably, the lyophilized excipient is mannitol and/or lactose. More preferably, the lyophilized excipient is mannitol.

The pharmaceutical composition of the polyethylene glycol-modified camptothecin derivative of the present invention is a solution injection, a suspension injection, an emulsion injection or sterile powder for injection. Preferably, the pharmaceutical composition is sterile powder for injection; more preferably, the pharmaceutical composition is a lyophilized preparation for injection.

Another aspect of the present invention is to provide a preparation method of the pharmaceutical composition of the polyethylene glycol-modified camptothecin derivative, the method comprises the following steps: (1) taking the polyethylene glycol-modified camptothecin derivative and lyophilized excipient, adding water for injection with a total volume of water for injection in the composition of 70% to 90%, stirring to make the solution completely dissolved; (2) adjusting the pH to 3.0 to 4.0 with the pH adjuster, adding water for injection to a full dose; (3) freeze-drying to obtain the product.

In a preferred embodiment of the present invention, the total volume of the water for injection added into components in the step (1) is 90%; stirring in the step (1) is stirring to make the solution completely dissolved, and the pH is adjusted to 3.0 to 4.0 with the pH adjuster in the step (2), the temperature in the process of adding water for injection to the full dose is lower than 30° C., preferably 15 to 30° C.; the preparation of the pharmaceutical composition of the polyethylene glycol-modified camptothecin derivative is completed within 10 hours, preferably within 8 hours.

In a specific embodiment of the present invention, the freeze-drying step in the step (3) is preferably pre-freezing at −20° C. to −40° C. for 4 to 8 hours and then completing sublimation drying within 40 to 60 hours, finally desorption drying at 25° C. for 4 to 8 hours. Preferably, the pre-freezing temperature is −40° C.

Yet another aspect of the present invention is to provide an application of the polyethylene glycol-modified camptothecin derivative pharmaceutical composition in the treatment of cancer. Preferably, the cancer is one of colorectal cancer, ovarian cancer, and lung cancer.

The pharmaceutical composition of the polyethylene glycol-modified camptothecin derivative of the present invention has a high stability and can conform to the molding requirements and quality requirements of preparation, and the stability of the preparation can be effectively improved by adjusting the pH of the medicated solution in the preparation method. But also by industrialized production, the pharmaceutical composition has been proved to may have very good process stability through an impact factor test, compatibility stability test, acceleration test, long-term test.

DETAILED DESCRIPTION OF THE INVENTION

The present invention will be further described in detail with reference to the following examples.

In the present invention, the straight-chain polyethylene glycol (with a molecular weight of 20,000 Daltons)-glutamate glycine pentapeptide-irinotecan is prepared according to patent CN103083680A, and other reagents are commercially available.

EXAMPLE 1 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof (Prescription 1)

Each 15 ampoules of the lyophilized preparation has a composition of:

Straight-chain polyethylene glycol-glutamate 4.275 g glycine pentapeptide-irinotecan Hydrochloric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 2.0 with 1.0% hydrochloric acid, and water for injection was added to the full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 2 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof (Prescription 2)

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Straight-chain polyethylene glycol-glutamate 4.275 g glycine pentapeptide-irinotecan Hydrochloric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.0 with 1.0% hydrochloric acid, and water for injection was added to the full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 3 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof (Prescription 3)

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Straight-chain polyethylene glycol-glutamate 4.275 g glycine pentapeptide-irinotecan Hydrochloric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 4.0 with 1.0% hydrochloric acid, and water for injection was added to the full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 4 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof (Prescription 4)

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Straight-chain polyethylene glycol-glutamate 4.275 g glycine pentapeptide-irinotecan Hydrochloric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 5.0 with 1.0% hydrochloric acid, and water for injection was added to the full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 5 Investigation of the pH Value Range of the Prepared Solution

The stability of the samples with the prepared solution pH value of 2, 3, 4 and 5, respectively, were investigated by taking the appearance character, related substances and solution clarity as the main indexes.

The prepared samples of different prescriptions were placed under the condition of high temperature (40° C.), respectively, and sampled at 5^(th), 10^(th) day, the appearance character, clarity and small molecules related substances of the samples were investigated, and the results are shown in Table 1.

TABLE 1 Investigation results of the prescriptions with different pH values Color and Maximum Total Pre- Ap- clarity after individual im- scription Time pearance re- Irinotecan impurity purity number (day) character dissolution (ppm) (ppm) (ppm) Pre- Day Yellow Transparent 4.06 76.10 114.2 scription 0 green yellow 1 block green Day Yellow Transparent 2.23 100.4 166.6 5 green yellow block green Day Yellow Transparent 30.28 189.3 276.2 10 green yellow block green Pre- Day Light Transparent 6.09 78.97 118.3 scription 0 yellow light 2 block yellow Day Light Transparent 23.57 94.53 158.0 5 yellow light block yellow Day Light Transparent 36.82 174.2 259.2 10 yellow light block yellow Pre- Day Light Transparent 12.79 84.17 130.7 scription 0 yellow light 3 block yellow Day Light Transparent 30.73 95.45 168.8 5 yellow light block yellow Day Light Transparent 45.10 174.4 268.0 10 yellow light block yellow Pre- Day Light Transparent 26.16 83.80 144.2 scription 0 yellow light 4 block yellow Day Light Transparent 70.17 131.8 248.7 5 yellow light block yellow Day Light Transparent 85.69 223.2 366.2 10 yellow light block yellow

It can be seen from the above results that, when the pH value of the prepared solution is low, the samples are yellow green, and when the pH value of the prepared solution is greater than 3, the samples are light yellow. The samples with Prescription 1, 2, 3 have a relatively small change of small molecular impurities, and a relatively good prescription stability after being placed at a high temperature of 40° C. for 10 days, however, the color of the sample with the prescription 1 is yellow green, which is greatly different from the character of the samples with other prescriptions. Therefore, under the condition of a pH value range of 3.0 to 4.0, the stability of the prescription can be relatively good.

EXAMPLE 6 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof (Prescription 5)

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Straight-chain polyethylene glycol-glutamate 4.275 g glycine pentapeptide-irinotecan Hydrochloric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with 1.0% hydrochloric acid, and water for injection was added to the full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 7 Detailed Investigation of the pH Value Range of the Prepared Solution

The pH value was investigated more detailed in the range of pH 3.0 to 4.0, the stability of the samples with the prepared solution pH value of 3.0, 3.4 to 3.6, 4.0, respectively, were investigated by taking the appearance character, related substances and solution clarity as the main indexes.

The prepared samples of different prescriptions were placed under the condition of high temperature (40° C.), respectively, and sampled at 5^(th), 10^(th) day, the appearance character, clarity and small molecules related substances of the samples were investigated, and the results are shown in Table 2.

TABLE 2 Investigation results of the prescriptions with detailed pH values Color and Maximum Total Pre- Appear- clarity after individual im- scription Time ance re- Innotecan impurity purity number (day) character dissolution (ppm) (ppm) (ppm) Pre- Day Light Transparent 6.27 15.81 49.64 scription 0 yellow light 2 block yellow Day Light Transparent 18.74 119.6 191.6 5 yellow light block yellow Day Light Transparent 33.01 117.7 192.5 10 yellow light block yellow Pre- Day Light Transparent 8.24 16.00 53.30 scription 0 yellow light 5 block yellow Day Light Transparent 19.55 122.4 190.0 5 yellow light block yellow Day Light Transparent 33.64 113.3 186.8 10 yellow light block yellow Pre- Day Light Transparent 15.87 19.58 68.09 scription 0 yellow light 3 block yellow Day Light Transparent 29.46 88.36 203.2 5 yellow light block yellow Day Light Transparent 54.20 100.3 211.6 10 yellow light block yellow

It can be seen from the above results that, in the range of prepared solution pH value of 3.0 to 4.0, the samples have a good stability, and have a relatively small change of small molecular impurities after being placed at a high temperature of 40° C. for 10 days, a pH range of the prepared solution in the product according to the present invention of 3.0 to 4.0, and an internal control pH of 3.4 to 3.6 are determined.

EXAMPLE 8 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof (Prescription 6)

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Straight-chain polyethylene glycol-glutamate 4.275 g glycine pentapeptide-irinotecan Acetic acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with acetic acid, and water for injection was added to the full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 9 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof (Prescription 7)

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Straight-chain polyethylene glycol-glutamate 4.275 g glycine pentapeptide-irinotecan Citric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with citric acid, and water for injection was added to the full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 10 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof (Prescription 8)

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Straight-chain polyethylene glycol-glutamate 4.275 g glycine pentapeptide-irinotecan Phosphoric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with phosphoric acid, and water for injection was added to the full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 11 Investigation of the pH Adjuster

The stability of the samples with different pH adjusters were investigated by taking the appearance character, related substances and solution clarity as the main indexes, and using hydrochloric acid, acetic acid, citric acid and phosphoric acid as pH adjuster, respectively, to adjust the prepared solution pH value to 3.4 to 3.6.

The samples were placed under the condition of a high temperature (40° C.), respectively, and sampled at 5^(th), 10^(th) day, the appearance character, clarity and small molecules related substances of the samples were investigated, and the results are shown in Table 3.

TABLE 3 Investigation results of the prescriptions with different pH adjusters Color and Maximum Total Pre- Appear- clarity after individual im- scription Time ance re- Irinotecan impurity purity number (day) character dissolution (ppm) (ppm) (ppm) Pre- Day 0 Light Transparent 17.53 24.29 75.03 scription yellow light 5 block yellow Day 5 Light Transparent 16.87 24.74 83.25 yellow light block yellow Day Light Transparent 29.67 46.12 125.0 10 yellow light block yellow Pre- Day 0 Light Transparent 21.20 28.69 75.74 scription yellow light 6 block yellow Day 5 Light Transparent 32.26 38.40 135.1 yellow light block yellow Day Light Transparent 32.64 50.51 137.0 10 yellow light block yellow Pre- Day 0 Light Transparent 146.6 60.99 281.8 scription yellow light 7 block yellow Day 5 Light Transparent 162.0 62.96 324.2 yellow light block yellow Day Light Transparent 176.1 63.01 364.2 10 yellow light block yellow Pre- Day 0 Light Transparent 32.95 25.23 81.61 scription yellow light 8 block yellow Day 5 Light Transparent 47.00 46.18 146.4 yellow light block yellow Day Light Transparent 59.19 67.02 180.8 10 yellow light block yellow

In the prescription samples with different pH adjusters, the sample with citric acid as the pH adjuster has a poor stability, and the other prescriptions are not very different, however, the sample with hydrochloric acid as the pH adjuster has the best stability relatively.

EXAMPLE 12 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof (Prescription 9)

Each 10 ampoules of the lyophilized preparation has a prescription composition of:

Straight-chain polyethylene glycol-glutamate 2.85 g glycine pentapeptide-irinotecan mannitol 1.8 g (3%) Hydrochloric acid Appropriate amount Water for injection Added to 60 mL

Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan and mannitol were taken, and was added with 54 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with 1.0% hydrochloric acid, and water for injection was added to the full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 13 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof (Prescription 10)

Each 10 ampoules of the lyophilized preparation has a prescription composition of:

Straight-chain polyethylene glycol-glutamate 2.85 g glycine pentapeptide-irinotecan mannitol 3.0 g (5%) Hydrochloric acid Appropriate amount Water for injection Added to 60 mL Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan and mannitol were taken, and was added with 54 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with 1.0% hydrochloric acid, and water for injection was added to the full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 14 Effect of Lyophilized Excipient on Formability of Lyophilized Samples

The effect of dosage of lyophilized excipient mannitol of 0%, 3%, 5%, respectively, on formability of the preparation was investigated by taking lyophilized formability, re-dissolvability as the main indicators, to optimize different prescription samples, and the results are shown in Table 4.

TABLE 4 Investigation results of the prescriptions with different dosage of mannitol Prescription Ratio of Lyophilized number mannitol formability Re-dissolvability Prescription 5 0% The content was The preparation Prescription 9 3% loose block with was dissolved when Prescription 10 5% a fine and smooth water was added, appearance, no the solution had a cracks, good good clarity. skeleton, without shrinking or collapse.

It can be seen from the above results that, the addition of mannitol has no effect on the formability and re-dissolvability of the product. Without the addition of mannitol, the lyophilized formability is good, and the content is loose block with a fine and smooth appearance, no cracks, good skeleton, without shrinking or collapse; and the re-dissolvability is good, the preparation is dissolved when water is added, and the solution has a good clarity.

As the product itself has a good lyophilized formability, it can be formed well without addition of any lyophilized excipients, and can conform to the quality requirements of lyophilized preparations.

EXAMPLE 15 Investigation of Stability of the Prepared Solution

The preparation temperature and the preparation time of solution in the solution preparation process were mainly investigated in this experiment. The stability of the solution under the condition of preparation temperature of 30° C., 50° C. and 70° C., and preparation time of 0, 2, 4 and 8 hours were investigated by taking the related substances as the main index.

3.8 g of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-irinotecan (3 copies were prepared in parallel) were weighed, respectively, and was added with 72 mL of water for injection, and stirred to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with 1.0% hydrochloric acid, and added to a constant volume which was the full dose (80 ml).

The solution was placed at constant temperature of 30° C. (Process 1), 50° C. (Process 2) and 70° C. (Process 3) (with shaking from time to time), respectively, and sampled at 0^(th), 2^(nd), 4^(th), 8^(th) hour. The results are shown in Table 5.

TABLE 5 Investigation results of stability of the prepared solution (small molecule related substances) Solution Pro- Solution place- Maximum cess Solution color ment individual Total num- preparation and time Irinotecan impurity impurity ber temperature clarity (hours) (ppm) (ppm) (ppm) Pro- 30° C. Light 0 8.12 18.33 56.74 cess yellow 2 9.39 19.97 62.12 1 trans- 4 10.22 20.89 61.99 parent 8 17.58 25.77 84.42 solution Pro- 50° C. Light 0 4.53 17.69 45.48 cess yellow 2 52.74 52.78 182.7 2 trans- 4 41.04 47.14 149.9 parent 8 75.99 71.76 258.9 solution Pro- 70° C. Light 0 3.20 15.91 41.76 cess yellow 2 75.12 59.15 233.6 3 trans- 4 138.85 112.3 399.1 parent 8 268.03 173.9 703.0 solution

It can be seen from the above results, with the solution preparation temperature raises, solution preparation time increases, the solution impurities are gradually increased. When Process 2 and Process 3 with solution preparation temperature of 50° C., 70° C., respectively are adopted, the small molecule impurities are significantly increased, therefore in the solution preparation process, the solution preparation temperature should be controlled not higher than 30° C., while the solution preparation, filtration, filling time should not exceed 8 hours.

EXAMPLE 16 Lyophilized Preparation of Y-type Polyethylene Glycol (with a Molecular Weight of 40,000 Daltons)-glutamate Glycine Pentapeptide-irinotecan and Preparation thereof

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Y-type polyethylene glycol-glutamate glycine 7.395 g pentapeptide-irinotecan Hydrochloric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the Y-type polyethylene glycol-glutamate glycine pentapeptide-irinotecan was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with 1.0% hydrochloric acid, and water for injection was added to full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 17 Lyophilized Preparation of Four-branched Polyethylene Glycol (with a Molecular Weight of 40,000 Daltons)-glutamate Glycine Icosapeptide-irinotecan and Preparation thereof

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Four-branched polyethylene glycol-glutamate 2.355 g glycine icosapeptide-irinotecan Hydrochloric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the four-branched polyethylene glycol-glutamate glycine icosapeptide-irinotecan was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with 1.0% hydrochloric acid, and water for injection was added to full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 18 Lyophilized Preparation of Straight-chain Polyethylene Glycol (with a Molecular Weight of 20,000 Daltons)-glutamate Glycine Pentapeptide-7-ethyl-10-hydroxycamptothecin and Preparation thereof

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Straight-chain polyethylene glycol-glutamate 4.155 g glycine pentapeptide-7-ethyl-10- hydroxycamptothecin Hydrochloric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the straight-chain polyethylene glycol-glutamate glycine pentapeptide-7-ethyl-10-hydroxycamptothecin was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with 1.0% hydrochloric acid, and water for injection was added to full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 19 Lyophilized Preparation of Y-type Polyethylene Glycol (with a Molecular Weight of 40,000 Daltons)-glutamate Glycine Pentapeptide-7-ethyl-10-hydroxycamptothecin and Preparation thereof

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Y-type polyethylene glycol-glutamate glycine 6.945 g pentapeptide-7-ethyl-10-hydroxycamptothecin Hydrochloric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the Y-type polyethylene glycol-glutamate glycine pentapeptide-7-ethyl-10-hydroxycamptothecin was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with 1.0% hydrochloric acid, and water for injection was added to full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 20 Lyophilized Preparation of Four-branched Polyethylene Glycol (with a Molecular Weight of 40,000 Daltons)-glutamate Glycine Icosapeptide-7-ethyl-10-hydroxycamptothecin and Preparation thereof

Each 15 ampoules of the lyophilized preparation has a prescription composition of:

Four-branched polyethylene glycol-glutamate 1.935 g glycine icosapeptide-7-ethyl-10- hydroxycamptothecin Hydrochloric acid Appropriate amount Water for injection Added to 90 mL Preparation process: a prescription amount of the four-branched polyethylene glycol-glutamate glycine icosapeptide-7-ethyl-10-hydroxycamptothecin was taken, and was added with 80 mL of water for injection, and stirred for 0.5 hour to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with 1.0% hydrochloric acid, and water for injection was added to full dose. The solution obtained was filtered through a 0.22 μm microporous filtering film, and subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

EXAMPLE 21 Study on Scale-up of Preparation Process

1. Sample Preparation

A pharmaceutical composition of straight-chain polyethylene glycol-glutamate glutamate pentapeptide-irinotecan for injection was prepared in the pilot production workshop according to the following process, with batch number of 120801, 120901, 121001 and 121201, respectively.

(1) Prescription:

Straight-chain polyethylene glycol-glutamate 285 g glutamate pentapeptide-irinotecan Hydrochloric acid Appropriate amount (the pH was adjusted to 3.4 to 3.6) Water for injection Added to 6000 ml Production 1000 ampoules

(2) Preparation Method:

285 g of the straight-chain polyethylene glycol-glutamate glycine icosapeptide-irinotecan was weighed, and was added with 90% of prescription amount of water for injection, and stirred to make the solution completely dissolved, and the pH was adjusted to 3.4 to 3.6 with hydrochloric acid, and water for injection was added to full dose. The solution obtained was subpackaged according to 6 ml/ampoule in the 100-class clean area, and pre-frozen at −40° C. for 4 to 8 hours, followed by being subjected to sublimation drying completed within 40 to 60 hours, and finally desorption drying at 25° C. for 4 to 8 hours, and plugged under vacuum and capped.

2. Impact Factor Test

The 120801 batch samples were taken for impact factor test, and test conditions were high temperature 60° C., high temperature 40° C., high humidity (RH92.5%) and strong light irradiation (4500Lx).

(1) Light Test

In a light cabinet at room temperature and with an intensity of illumination of 4500Lx, the samples with external packing and without external packing were placed at the same time for 10 days, and sampled at 5^(th) and 10^(th) day for various inspections, and the results are shown in Table 6.

TABLE 6 Investigation results of light test (1) Insoluble particles Visible Time Placement pH (grain/ampoule) foreign (day) condition Character value Moisture ≥10 um ≥25 um matter 0 Random Light yellow loose 3.48 1.26% 965 7 1, 0, 0, 1, 1 block 5 Without Dark yellow loose 3.11 1.34% — — 1, 0, 0, 0, 0 external block packing With Light yellow loose 3.62 1.37% 1243 28 0, 1, 0, 0, 0 external block packing 10 Without Tan loose block 3.02 1.40% — — 0, 0, 0, 0, 0 external packing With Light yellow loose 3.78 1.41% 778 22 0, 0, 0, 0, 1 external block packing Investigation results of light test (2) Osmotic pressure (mOsmol · kg⁻¹) 0.9% Sodium Glucose for Time Placement chloride injection Solution (day) condition 10 mg/ml 30 mg/ml 10 mg/ml 30 mg/ml clarity Solution color 0 Random 290 308 276 304 Equal to Lighter than No. 1 Yellow No. 1 5 Without 288 306 278 304 Lighter Lighter than external than No. 1 Yellow No. 3 packing With 288 304 279 305 Lighter Lighter than external than No. 1 Yellow No. 1 packing 10 Without 290 308 276 305 Lighter Lighter than external than No. 1 Yellow No. 5 packing With 290 306 278 306 Lighter Lighter than external than No. 1 Yellow No. 1 packing Investigation results of light test (3) Small molecule related substances (ppm) Macromolecule related Maximum substances (%) Time Placement individual Total Single Free Content (day) condition Irinotecan impurity impurity Disubstituted substituted PEG (%) 0 Random 11.94 33.60 73.93 6.99 0.58 1.28 99.26 5 Without 34.78 1689.97 2612.60 16.33 2.55 3.17 67.76 external packing With 25.35 37.91 113.14 7.27 0.68 1.44 99.52 external packing 10 Without 42.13 2289.93 3538.04 15.81 2.83 3.29 73.23 external packing With 10.57 24.37 97.96 7.21 0.73 1.60 100.24 external packing

The results show that: (1) the product is very sensitive to light, and must be sealed and kept shading for preservation; (2) in the designed packaging conditions, after light test, the appearance character, pH, moisture, visible foreign matter, insoluble particles, solution clarity and color have no significant change compared with those at 0^(th) day, and both the related substances and content detection have no significant change.

(2) High Temperature Test

The product was taken, removed the external packing, and placed under 40° C. condition for 10 days, and sampled at 5th and 10th day for various inspections, and the results are shown in Table 7.

TABLE 7 Investigation results of high temperature test (1) Insoluble particles Visible Time (grain/ampoule) foreign (day) Character pH value Moisture ≥10 um ≥25 um matter 0 Light yellow loose 3.48 1.26% 965 7 1, 0, 0, 1, 1 block 5 Light yellow loose 3.42 1.35% 1072 110 0, 1, 0, 0, 0 block 10 Light yellow loose 3.33 1.34% 996 3 2, 0, 0, 0, 0 block Investigation results of high temperature test (2) Osmotic pressure (mOsmol · kg⁻¹) 0.9% Sodium Time chloride Glucose for injection (day) 10 mg/ml 30 mg/ml 10 mg/ml 30 mg/ml Solution clarity Solution color 0 290 308 276 304 Equal to No. 1 Lighter than Yellow No. 1 5 290 310 279 304 Lighter than No. Lighter than 1 Yellow No. 1 10 291 308 278 308 Lighter than No. Lighter than 1 Yellow No. 1 Investigation results of high temperature test (3) Small molecule related substances(ppm) Maximum Macromolecule related substances(%) Time individual Total Single Content (day) Irinotecan impurity impurity Disubstituted substituted Free PEG (%) 0 11.94 33.60 73.93 6.99 0.58 1.28 99.26 5 16.34 38.88 136.64 7.51 0.71 1.93 99.41 10 10.82 115.47 182.91 7.64 0.77 2.05 99.42

The results show that: after high temperature test, the appearance character, pH, moisture, visible foreign matter, osmotic pressure, insoluble particles, solution clarity and color, content of the product have no significant change compared with those at 0^(th) day, and the small molecule, macromolecule related substances are slightly increased, indicating that the product is sensitive to heat, and should be kept cold for preservation.

(3) High Humidity Test

The product was taken, removed the external packing, and placed under the condition of a high humidity (RH92.5%, T=25° C.) for 10 days, and sampled at 5^(th) and 10^(th) day for various inspections, and the results are shown in Table 8.

TABLE 8 Investigation results of high humidity test (1) Insoluble particles Visible Time (grain/ampoule) foreign (day) Character pH value Moisture ≥10 um ≥25 um matter 0 Light yellow loose 3.48 1.26% 965 7 1, 0, 0, 1, 1 block 5 Light yellow loose 3.87 1.58% 780 12 2, 0, 0, 0, 0 block 10 Light yellow loose 3.96 1.60% 1483 25 0, 3, 0, 0, 0 block Investigation results of high humidity test (2) Osmotic pressure (mOsmol · kg−1) Time 0.9% Sodium chloride Glucose for injection Solution (day) 10 mg/ml 30 mg/ml 10 mg/ml 30 mg/ml clarity Solution color 0 290 308 276 304 Equal to No. 1 Lighter than Yellow No. 1 5 290 306 276 306 Lighter than Lighter than No. 1 Yellow No. 1 10 288 309 274 304 Lighter than Lighter than No. 2 Yellow No. 1 Investigation results of high humidity test (3) Small molecule related substances (ppm) Macromolecule related substances Maximum (%) Time individual Total Single Content (day) Irinotecan impurity impurity Disubstituted substituted Free PEG (%) 0 11.94 33.60 73.93 6.99 0.58 1.28 99.26 5 21.05 40.38 115.64 7.77 0.74 1.96 100.38 10 11.04 25.32 111.07 7.33 0.72 2.18 100.12

The results show that: after high humidity test, the appearance character, pH, moisture, visible foreign matter, osmotic pressure, insoluble particles, solution clarity and color, related substances, content of the product have no significant change compared with those at 0^(th) day, indicating that the product is not sensitive to humidity.

3. Compatibility Stability Test

The 120801 batch samples were taken, and the compatibility of the sample and 0.9% sodium chloride injection and 5% glucose injection, respectively, were investigated, and sampled at 0^(th), 2^(nd), 4^(th), 8^(th) hour for the detection of small molecule related substances, and the results shown in Table 9.

TABLE 9 Change of related substances in compatibility at different time Compatibility of the Compatibility of the sample and sodium sample and chloride injection (ppm) glucose injection (ppm) Maximum Maximum Time individual Total individual Total (h) Irinotecan impurity impurity Irinotecan impurity impurity 0 3.60 19.32 73.76 4.11 27.00 101.63 1 5.97 26.63 83.51 5.90 47.04 115.17 2 8.04 26.19 88.83 8.08 46.67 123.49 4 10.07 20.76 97.18 11.56 38.59 134.94 8 16.43 20.04 107.56 16.31 48.57 134.79

In the compatibility test of the sample and 0.9% sodium chloride injection and 5% glucose injection, respectively, the product has a good stability within 8 hours.

4. Acceleration Test

The samples with packing were placed in a constant temperature and humidity chamber at a temperature of 25° C.±2° C. and a relative humidity of 60%±10% for 6 months, and sampled at 1^(st), 2^(nd), 3^(rd), 6^(th) month, respectively, for various inspections; and the sample at 6^(th) month was taken for bacterial endotoxin and sterile examination. The accelerated test results are shown in Table 10, 11, 12.

TABLE 10 Acceleration test results of the 120901 batch preparation sample (1) Insoluble particles Visible Time Placement (grain/ampoule) foreign (month) condition Character pH value Moisture ≥10 um ≥25 um matter 0 Random Yellow loose 3.54 1.18% 2627 30 1, 0, 0, 0, 0 block 1 Random Yellow loose 3.71 1.07% 3363 20 0, 0, 0, 0, 0 block 2 Random Yellow loose 3.67 1.21% 2665 0 0, 1, 1, 0, 0 block 3 Placed Yellow loose 3.71 1.15% 2208 22 2, 0, 0, 0, 0 forward block Placed upside Yellow loose 3.63 1.16% 2053 30 0, 0, 1, 0, 1 down block 6 Placed Yellow loose 3.70 1.23% 2600 15 0, 0, 0, 0, 2 forward block Placed upside Yellow loose 3.73 1.20% 2648 25 0, 1, 0, 0, 0 down block Acceleration test results of the 120901 batch preparation sample (2) Osmotic pressure (mOsmol · kg⁻¹) 0.9% Sodium Glucose for chloride injection Bacterial Time Placement 10 30 10 30 Solution Solution endotoxin (month) condition mg/ml mg/ml mg/ml mg/ml clarity color Sterile (EU/mg) 0 Random 294 308 272 302 Equal to Lighter The 0^(th) 1 Random 293 306 272 304 No. 2 than examination month: 2 Random 296 308 274 301 Yellow at 0^(th), 6^(th)  0.006; 3 Placed 295 310 274 300 No. 2 month 6^(th) forward conformed month: Placed 296 306 275 306 to the <0.004 upside regulations. down 6 Placed 296 306 276 301 forward Placed 294 309 276 306 upside down Acceleration test results of the 120901 batch preparation sample (3) Small molecule related substances (ppm) Macromolecule related Maximum substances (%) Placement individual Total Single Free Content Time condition Irinotecan impurity impurity Disubstituted substituted PEG (%) Month Random 6.64 17.99 52.30 7.76 0.70 1.35 101.9 0 Month Random 11.17 19.51 70.48 7.41 0.84 1.27 100.8 1 Month Random 7.26 22.37 104.9 7.52 0.63 1.13 101.8 2 Month Placed 11.01 23.54 103.7 7.14 0.64 1.09 101.7 3 forward Placed 13.48 32.88 124.6 7.08 0.55 1.13 102.1 upside down Month Placed 14.74 21.17 119.8 7.24 0.69 1.29 102.0 6 forward Placed 17.52 27.20 108.7 7.41 0.79 1.36 101.5 upside down

TABLE 11 Acceleration test results of the 121001 batch preparation sample (1) Insoluble particles Visible Time Placement (grain/ampoule) foreign (month) condition Character pH value Moisture ≥10 um ≥25 um matter 0 Random Yellow loose 3.50 1.22% 738 38 1, 2, 0, 0, 0 block 1 Random Yellow loose 3.63 1.12% 728 7 1, 0, 0, 0, 0 block 2 Random Yellow loose 3.66 1.18% 653 5 0, 0, 0, 1, 0 block 3 Placed Yellow loose 3.61 1.24% 592 3 0, 0, 2, 0, 1 forward block Placed Yellow loose upside block 3.58 1.23% 950 5 0, 0, 0, 0, 1 down 6 Placed Yellow loose 3.65 1.25% 922 8 0, 0, 1, 1, 0 forward block Placed Yellow loose 3.63 1.24% 773 13 1, 0, 0, 0, 0 upside block down Acceleration test results of the 121001 batch preparation sample (2) Osmotic pressure (mOsmol · kg⁻¹) 0.9% Sodium Glucose for chloride injection Bacterial Time Placement 10 30 10 30 Solution Solution endotoxin (month) condition mg/ml mg/ml mg/ml mg/ml clarity color Sterile (EU/mg) 0 Random 292 303 276 302 Lighter Lighter The 0^(th) 1 Random 291 306 274 302 than No. than examination month: 2 Random 294 302 277 306 1 Yellow at 0^(th), 6^(th) 0.015; 3 Placed 294 304 274 302 No. 2 month 6^(th) forward conformed month: Placed 292 305 277 306 to the <0.004 upside regulations. down 6 Placed 296 302 278 306 forward Placed 293 306 276 305 upside down Acceleration test results of the 121001 batch preparation sample (3) Small molecule related substances (ppm) Macromolecule related Maximum substances (%) Placement individual Total Single Free Content Time condition Irinotecan impurity impurity Disubstituted substituted PEG (%) Month Random 4.21 19.34 47.49 7.51 0.81 1.17 102.4 0 Month Random 11.95 19.66 66.96 7.66 0.80 1.35 101.3 1 Month Random 4.90 25.60 99.55 7.38 0.67 1.53 101.4 2 Month Placed 14.11 21.44 172.8 7.57 0.73 1.27 102.6 3 forward Placed 11.37 73.78 128.0 7.70 0.71 1.47 102.0 upside down Month Placed 16.60 17.80 110.2 7.55 0.79 1.49 102.4 6 forward Placed 4.21 19.34 47.49 7.51 0.81 1.17 102.4 upside down

TABLE 12 Acceleration test results of the 121201 batch preparation sample (1) Insoluble particles Time Placement (grain/ampoule) Visible (month) condition Character pH value Moisture ≥10 um ≥25 um foreign matter 0 Random Yellow loose 3.43 1.15% 1838 2 1, 1, 0, 0, 0 block 1 Random Yellow loose 3.55 1.17% 1967 30 0, 1, 0, 1, 0 block 2 Random Yellow loose 3.62 1.14% 1853 43 0, 0, 0, 1, 0 block 3 Placed Yellow loose 3.71 1.20% 1108 8 1, 0, 0, 0, 0 forward block Placed Yellow loose 3.62 1.21% 1213 15 0, 0, 0, 0, 2 upside block down 6 Placed Yellow loose 3.59 1.19% 933 2 0, 0, 0, 0, 1 forward block Placed Yellow loose 3.72 1.20% 975 8 0, 0, 1, 1, 0 upside block down Acceleration test results of the 121201 batch preparation sample (2) Osmotic pressure (mOsmol · kg⁻¹) 0.9% Sodium Glucose for chloride injection Bacterial Time Placement 10 30 10 30 Solution Solution endotoxin (month) condition mg/ml mg/ml mg/ml mg/ml clarity color Sterile (EU/mg) 0 Random 295 308 275 305 Lighter Lighter The 0^(th) 1 Random 296 310 277 302 than No. than examination month: 2 Random 293 308 274 306 1 Yellow at 0^(th), 6^(th) <0.004; 3 Placed 295 306 274 305 No. 2 month 6^(th) forward conformed month: Placed 294 306 279 308 to the <0.004 upside regulations. down 6 Placed 294 305 276 306 forward Placed 294 308 278 307 upside down Acceleration test results of the 121201 batch preparation sample (3) Small molecule related substances (ppm) Macromolecule related Maximum substances (%) Placement individual Total Single Free Content Time condition Irinotecan impurity impurity Disubstituted substituted PEG (%) Month Random 5.32 17.37 43.07 7.59 0.68 1.47 103.6 0 Month Random 16.88 19.87 87.95 7.83 0.65 1.80 102.6 1 Month Random 9.34 26.14 97.29 7.59 0.67 1.65 103.1 2 Month Placed 13.83 23.41 130.1 7.57 0.74 1.85 103.5 3 forward Placed 15.83 25.29 131.9 7.79 0.70 2.00 103.3 upside down Month Placed 13.68 21.15 126.7 7.41 0.68 1.50 103.6 6 forward Placed 18.04 22.11 139.9 7.50 0.69 1.45 103.6 upside down

In the investigation of acceleration test for 6 months, the appearance character, pH, moisture, visible foreign matter, osmotic pressure, insoluble particles, solution clarity and color, macromolecule related substances, content of the product have no significant change, small molecule related substances, the total impurity are slightly increased, but are within the limits, the product is stable in the conditions.

5. Long-Term Test

The preparation samples were placed in a constant temperature and humidity chamber at a temperature of 4 to 8° C., forward and overturned, respectively, for 12 months, and sampled at 0^(st), 3^(rd), 6^(th), 9^(th), 12^(th) month, respectively, for various inspections, and the sample at 12^(th) month was taken for bacterial endotoxin and sterile examination. The long-term test results are shown in Table 13, 14, 15.

TABLE 13 Long-term test results of the 120901 batch preparation sample (1) Insoluble particles Time Placement (grain/ampoule) Visible (month) condition Character pH value Moisture ≥10 um ≥25 um foreign matter 0 Random Yellow loose block 3.54 1.18% 2627 30 1, 0, 0, 0, 0 3 Placed Yellow loose block 3.70 1.17% 3285 57 1, 0, 0, 0, 0 forward Placed Yellow loose block 3.68 1.15% 2498 7 0, 0, 0, 0, 0 upside down 6 Placed Yellow loose block 3.76 1.12% 2063 10 0, 0, 0, 0, 0 forward Placed Yellow loose block 3.71 1.13% 2638 35 0, 2, 0, 0, 0 upside down 9 Random Yellow loose block 3.63 1.19% 1835 0 0, 2, 0, 0, 0 12 Placed Yellow loose block 3.66 1.16% 1923 42 0, 0, 0, 1, 1 forward Placed Yellow loose block 3.59 1.18% 1507 53 1, 0, 0, 0, 1 upside down Long-term test results of the 120901 batch preparation sample (2) Osmotic pressure (mOsmol · kg⁻¹) 0.9% Sodium Glucose for chloride injection Bacterial Time Placement 10 30 10 30 Solution Solution endotoxin (month) condition mg/ml mg/ml mg/ml mg/ml clarity color Sterile (EU/mg) 0 Random 294 308 272 302 Equal to Lighter The 0^(th) 3 Placed 291 308 274 304 No. 2 than examination month: forward Yellow at 0th, 12th 0.006 Placed 295 306 276 304 No. 2 month 12^(th) upside conformed month: down to the <0.004 6 Placed 296 304 274 300 regulations. forward Placed 294 310 276 304 upside down 9 Random 294 307 274 304 12 Placed 296 305 276 300 forward Placed 294 307 278 306 upside down Long-term test results of the 120901 batch preparation sample (3) Small molecule related substances (ppm) Macromolecule related Maximum substances (%) Placement individual Total Single Free Content Time condition Irinotecan impurity impurity Disubstituted substituted PEG (%) Month Random 6.64 17.99 52.30 7.76 0.70 1.35 101.9 0 Month Placed 8.83 22.75 89.79 6.64 0.56 0.89 102.0 3 forward Placed 9.67 22.88 89.93 7.15 0.55 0.98 102.4 upside down Month Placed 12.82 22.20 95.05 7.26 0.81 1.18 101.2 6 forward Placed 13.73 24.01 96.13 7.39 0.78 1.24 102.5 upside down Month Random 10.17 58.54 114.6 7.19 0.84 1.05 100.8 9 Month Placed 11.32 18.97 126.2 7.12 0.77 1.14 102.5 12 forward Placed 12.03 17.09 109.5 7.08 0.76 1.17 102.1 upside down

TABLE 14 Long-term test results of the 121001 batch preparation sample (1) Insoluble particles Time Placement (grain/ampoule) Visible (month) condition Character pH value Moisture ≥10 um ≥25 um foreign matter 0 Random Yellow loose block 3.50 1.22% 738 38 1, 2, 0, 0, 0 3 Placed Yellow loose block 3.65 1.15% 1118 5 0, 1, 1, 1, 0 forward Placed Yellow loose block 3.59 1.14% 948 13 0, 0, 0, 0, 0 upside down 6 Placed Yellow loose block 3.58 1.21% 997 60 0, 1, 0, 0, 0 forward Placed Yellow loose block 3.60 1.20% 858 28 0, 0, 0, 0, 0 upside down 9 Random Yellow loose block 3.54 1.19% 998 7 1.0, 01, 1 12 Placed Yellow loose block 3.53 1.23% 1360 30 1, 0, 0, 0, 1 forward 12 Placed Yellow loose block 3.59 1.21% 847 7 0, 1, 0, 0, 0 upside down Long-term test results of the 121001 batch preparation sample (2) Osmotic pressure (mOsmol · kg⁻¹) 0.9% Sodium Glucose for chloride injection Bacterial Time Placement 10 30 10 30 Solution Solution endotoxin (month) condition mg/ml mg/ml mg/ml mg/ml clarity color Sterile (EU/mg) 0 Random 292 303 276 302 Lighter Lighter The 0^(th) 3 Placed 291 306 275 300 than No. than examination month: forward 1 Yellow at 0th, 12th 0.015 Placed 292 308 278 304 No. 2 month 12^(th) upside conformed month: down to the <0.004 6 Placed 292 303 274 304 regulations. forward Placed 296 309 279 306 upside down 9 Random 292 305 278 304 12 Placed 293 302 276 306 forward Placed 296 306 276 302 upside down Long-term test results of the 121001 batch preparation sample (3) Small molecule related substances (ppm) Macromolecule related Maximum substances (%) Placement individual Total Single Free Content Time condition Irinotecan impurity impurity Disubstituted substituted PEG (%) Month Random 4.21 19.34 47.49 7.51 0.81 1.17 102.4 0 Month Placed 12.52 63.66 116.8 7.39 0.65 1.15 102.3 3 forward Placed 15.79 62.99 125.4 7.53 0.77 1.26 102.6 upside down Month Placed 13.06 23.51 109.8 7.27 0.80 1.30 101.9 6 forward Placed 17.15 23.02 109.3 7.17 0.77 1.28 101.8 upside down Month Random 8.71 37.27 124.8 7.18 0.76 1.22 100.5 9 Month Placed 10.59 89.78 167.8 7.04 0.76 1.01 101.5 12 forward Placed 12.96 27.67 116.0 7.23 0.86 1.21 101.0 upside down

TABLE 15 Long-term test results of the 121201 batch preparation sample (1) Insoluble particles Visible Time Placement pH (grain/ampoule) foreign (month) condition Character value Moisture ≥10 um ≥25 um matter 0 Random Yellow loose block 3.43 1.15% 1838 2 1, 1, 0, 0, 0 3 Placed Yellow loose block 3.46 1.19% 1430 88 0, 1, 1, 0, 0 forward Placed Yellow loose block 3.56 1.17% 1090 15 0, 0, 0, 0, 1 upside down 6 Placed Yellow loose block 3.48 1.16% 648 2 0, 0, 0, 0, 2 forward Placed Yellow loose block 3.39 1.14% 792 8 1, 0, 0, 0, 0 upside down 9 Random Yellow loose block 3.41 1.08% 827 0 1, 0, 0, 0, 0 12 Placed Yellow loose block 3.55 1.17% 640 0 1, 2, 0, 0, 0 forward 12 Placed Yellow loose block 3.59 1.18% 748 0 0, 0, 0, 0, 0 upside down Long-term test results of the 121201 batch preparation sample (2) Osmotic pressure (mOsmol · kg⁻¹) 0.9% Sodium Glucose for chloride injection Bacterial Time Placement 10 30 10 30 Solution Solution endotoxin (month) condition mg/ml mg/ml mg/ml mg/ml clarity color Sterile (EU/mg) 0 Random 295 308 275 305 Lighter Lighter The 0^(th) 3 Placed 294 308 274 306 than than examination month forward No. 1 Yellow at 0th, 12th <0.004 Placed 294 308 276 304 No. 2 month 12^(th) upside conformed month: down to the <0.004 6 Placed 296 306 276 304 regulations. forward Placed 296 306 276 305 upside down 9 Random 294 309 279 304 12 Placed 292 306 276 303 forward Placed 292 306 275 304 upside down Long-term test results of the 121201 batch preparation sample (3) Small molecule related substances (ppm) Macromolecule related Maximum substances (%) Placement individual Total Single Content Time condition Irinotecan impurity impurity Disubstituted substituted Free PEG (%) Month Random 5.32 17.37 43.07 7.59 0.68 1.47 103.6 0 Month Placed 11.56 21.67 96.98 7.74 0.67 1.94 102.8 3 forward Placed 13.97 26.94 107.4 7.62 0.71 2.01 102.0 upside down Month Placed 8.95 21.03 119.8 7.41 0.73 1.49 103.0 6 forward Placed upside 12.11 27.11 140.38 7.36 0.72 1.47 103.5 down Month Random 11.88 21.18 132.6 7.21 0.72 1.40 102.5 9 Month Placed 12.54 19.37 130.4 7.25 0.81 1.29 102.8 12 forward Placed 18.38 25.39 121.6 7.18 0.72 1.40 102.2 upside down

In the investigation of accelerated long-term test for 12 months, the character, pH, moisture, visible foreign matter, osmotic pressure, insoluble particles, solution clarity and color, macromolecule related substances, content of the product have no significant change, small molecule related substances and the total impurity are slightly increased, indicating that the product has a good stability within 12 months. 

The invention claimed is:
 1. A pharmaceutical composition of a polyethylene glycol-modified camptothecin derivative, being a lyophilized preparation prepared by a preparation process with the following components: a polyethylene glycol-modified camptothecin derivative, pH adjuster and water for injection, the pharmaceutical composition comprises 100 to 500 mg of the polyethylene glycol-modified camptothecin derivative, wherein in the preparation process, the pH value of the water for injection comprising the polyethylene glycol-modified camptothecin derivative is adjusted to the range of 3.0 to 4.0 by the pH adjuster, and then a lyophilized preparation is prepared in accordance with a freeze-drying procedure, wherein: the polyethylene glycol-modified camptothecin derivative has the structure of general formula (I):

wherein: PEG is a straight-chain polyethylene glycol residue having the structure of general formula (II):

or, PEG is a Y-type polyethylene glycol residue having the structure of general formula (III):

PEG has a molecular weight of 300 to 60,000 Daltons; wherein I is an integer of 10 to 1,500 A₁ is aspartic acid residue

 or glutamic acid residue

 A₂ is selected from the group consisting of glycine residue

 alanine residue

 leucine residue

 isoleucine residue

 valine residue

 phenylalanine residue

 and methionine residue

m is an integer of 2 to 12; n is an integer of 0 to 6; and CPT is a camptothecin derivative residue selected from the group consisting of: 10-hydroxycamptothecin residue

 7-ethyl-10-hydroxycamptothecin residue

 9-nitrocamptothecin residue

 9-aminocamptothecin residue

 irinotecan residue

 topotecan residue

 belotecan residue

 exatecan residue

 lurtotecan residue

 diflomotecan residue

 gimatecan residue

 and karenitecin residue


2. The pharmaceutical composition of claim 1, wherein the A₁ is glutamic residue acid, the A₂ is glycine residue.
 3. The pharmaceutical composition of claim 1, wherein the m is 2 to
 6. 4. The pharmaceutical composition of claim 1, wherein n is 0, 1, 2 or
 3. 5. The pharmaceutical composition of claim 1, wherein the pH adjuster is one or a combination of more than two selected from the group consisting of hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, carbonic acid, toluenesulfonic acid, methanesulfonic acid, acetic acid, citric acid, malonic acid, tartaric acid, succinic acid, benzoic acid, ascorbic acid, a-ketoglutaric acid and a-glycerophosphoric acid, the pH adjuster is used to adjust the pH of the aqueous solution for injection comprising the polyethylene glycol-modified camptothecin derivative to 3.0 to 4.0.
 6. The pharmaceutical composition of claim 5, wherein the pH adjuster is one or a combination more than two selected from the group consisting of hydrochloric acid, acetic acid and phosphoric acid.
 7. The pharmaceutical composition of claim 1, wherein in addition to the polyethylene glycol-modified camptothecin derivative, the pH adjuster and the water for injection, the components further comprises a lyophilized excipient.
 8. The pharmaceutical composition of claim 7, wherein the lyophilized excipient is mannitol and/or lactose.
 9. The pharmaceutical composition of claim 7, wherein the addition of the lyophilized excipient is 0 to 10% of the water for injection comprising the polyethylene glycol-modified camptothecin derivative by weight/volume ratio.
 10. A preparation method of the pharmaceutical composition of the polyethylene glycol-modified camptothecin derivative of claim 1, comprising the following steps: (1) taking the polyethylene glycol-modified camptothecin derivative and adding a lyophilized excipient, adding water for injection with a total volume of water for injection in the composition of 70% to 90%, stirring to make the solution completely dissolved; (2) adjusting the pH to 3.0 to 4.0 with pH adjuster, adding water for injection to a full dose; (3) freeze-drying to obtain the product.
 11. The preparation method of claim 10, wherein the total volume of the water for injection added into components in the step (1) is 90%; stirring in the step (1) is stirring to make the solution completely dissolved, and the pH is adjusted to 3.0 to 4.0 with the pH adjuster in the step (2), the temperature in the process of adding water for injection to the full dose is lower than 30° C. 